Opps! I lied, the solution was in the book!
This is how you use the pieces to form a square and a triangle.
Anyway, David G. Wells has written several books on mathematics that will offer you several hours of recreation in mathematics. You should check out his books on Amazon.com or any one of many book retailers (such as Barns and Noble or Books-A-Million).
Books-A-Million has a cool mathematical name!